Migrering til MongoDB:hvordan man forespørger GROUP BY + WHERE

Der er eksempler på dette overalt i dokumentationen, Google og denne side.

Nogle referencer:

• http://api.mongodb.org/python/current/ examples/aggregation.html
• http://docs.mongodb.org/manual/reference/aggregation /gruppe/
• http://docs.mongodb.org/manual/reference/aggregation /sum/

Og for noget kode:

self.db.aggregate(
    # Lets find our records
    {"$match":{"Time":{"$gte":100,"$lte":1000}}}, 

    # Now lets group on the name counting how many grouped documents we have
    {"$group":{"_id":"$name", "sum":{"$sum":1}}} 
)